a flip-flop or latch is a circuit that has two stable states and can be used to store state information.

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What does splitter do in logisim?

I have just started learning logisim, so i have a very simple question. My question is what does splitter do. Whats its function and how can we actually implement it(like on breadboard or trainer ...
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163 views

How to create a frequency doubler circuit using only flipflops/ Digital elements?

First things first, is it even possible to scale up the frequency using only digital elements, atleast approximately? Though a frequency divider circuit can be designed very easily with flipflops. In ...
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63 views

JK Flip Flop Counter

I am designing a counter circuit that will perform the following function: A sequential circuit with three flip-flips A, B and C and two inputs X and Y. If X=0 and Y=0, the counter remains in the ...
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35 views

Significance of negative setup and hold time

What do you mean by negative setup and hold time i.e what happens if hold time is negative or setup time is negative. Does -ve setup or hold have any advantage ?
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37 views

Rising edge pulse detector from logic gates

The circuits I describe are entirely made of 7400 series logic gates (7402, 7404 and 7408 ic). I'm trying to build a rising (positive) edge pulse detector using logic gates. The following circuit ...
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4answers
54 views

is flip flop a synchronous or an asynchronous sequential circuit?

i have read in my text book that : " A flip-flop is the simplest synchronous sequential circuit. " but it is not convincing at all since we cannot analyze or build a flip flop like a synchronous ...
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SR Flip-flop builded from 2 SR-Latch

I just study about flip-flop in my class and this is the picture from the slide my teacher used that explain the construction of SR Flip-flop However, I find something was wrong with this figure. ...
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34 views

Using a block diagram for the RS flipflop, add appropriate gates for a D-flipflop

I have been given the problem "Using a block diagram for the RS flipflop, add appropriate gates for a D-flipflop". Now, I can create the gate diagram for both RS flipflop and D flipflop ...
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119 views

**Solved** D Flip Flop Frequency Divider - Simulates but doesn't work on protoboard *Pics/Simulation Data Included*

I'm having a problem that is probably trivial, but I can't seem to make any progress. Just a disclaimer, I'm an analog EE and digital design isn't my strong suite. That being said, I'm trying to build ...
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45 views

How to convert this NOT/AND/OR counter to an all NAND counter?

Sequence: 000,010,111,001,100... Have to build it using a JK Flip Flop for Q0 and 2 D flip flops for Q1 and Q2 and all NAND gates. Basically I have no problem building this counter with just the ...
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275 views

SR Flip Flop: NOR or NAND?

I started studying flip flips recently and I am stuck at this point: At some video tutorials, people explain the SR Flip Flop like this: So they use NAND gates, producing a transition table like ...
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28 views

number of bits of information for n stable states?

my text book says "An element with N stable states conveys log2N bits of information" i don't understand it since i expect if we have n stable states we would have n/2 bits since one of them is ...
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56 views

Design serial adder for 16 bit register using on full FA

I wrote a serial bit adder for a 15 bit width shift register and a full adder (positive edge trigger, asynchronous reset) I don't know where the error in this code is. This is the code: ...
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1answer
67 views

Can I use an AND gate before a clock input?

Can I use an AND gate with a clock input? For example, in the picture below, I have a positive-edge D flip-flop. I'm using an AND gate with the Select_chip input and the Clock input but I'm not sure ...
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47 views

Constructing a Sequential Circuit with two D Flip Flops

A sequential circuit with two D flip flops (A and B), two inputs (x and y), and one output (z) is specified by the following next-state and output equations: A(t+1) = xy' + xB B(t+1) = xA + xB' z = ...
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1/6 Clock Frequency Divider

How would I design a circuit made of rising edge triggered flip flops and inverters to make its output 1/6 of the clock frequency. Cheers
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56 views

Quiz Buzzer circuit using IC 74LS373. Not resetting after cutting off supply

I am confronted with a buzzer circuit using a 74LS373 which is a 3 state octal D type transparent latch and edge triggered flip flop. This is my first ever attempt to use this type of IC. My search ...
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44 views

How could I set up a circuit that keeps track of strikes in a baseball game using D flip flops in Multisim?

What I want is two LED lights and a push button. When the push button is pressed the first time, the first light lights up. When it's pressed a second time, the second light lights up. When it's ...
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Why is it when I set up a Johnson counter, the number sequence rotates fine, but I can't get a ring counter right (explanation below)?

With a Johnson counter, I hook up every flip flop's Q output to the following flip flop's D input, for D flip flops. And then the final Q' output is hooked into the first flip flop's D input. When I ...
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1answer
63 views

Verilog inital value for flip flop

I am trying to write verilog code that will set the initial value of the output of a positive-edge triggered flip-flop to 0. The behaviour of the flip-flop circuit is exactly what I want AFTER the ...
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162 views

Reduced clock speed with flip flop

My question is if there is a way to reduce a clock to two thirds of its speed using flip flops because i know a flip flop cuts its speed in half.
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What would be the truth table for the following inputs with a positive edge triggered D flip flop?

This is what I got, but I'm guessing I did something wrong: ...
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31 views

How is this method of addressing memory scalable?

I've been watching Computerphile videos about memory. I'm currently watching this one In it he goes over using some logic gates to address flip flops. He explains that is is cumbersome to add a wire ...
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88 views

OP-AMP Flip Flop start up predictability

A customer had asked for a circuit design which I felt would be fun to implement using a couple of OP amps. (Its always fun to see if you can do something with op amps instead of a small MCU ). Anyway ...
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62 views

S-R latch / flip- flop question

First I want to ask, why are S and R inverted when comparing an S-R latch with NAND and NOR gate. It just seems odd to me that they're being inverted. Secondly, why is a multi-transition behaviour a ...
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JK flip-flop and sequence network

State diagram of the sequence network S looks like the following for a jk flip-flop: Is this the right truth table for it? ...
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109 views

Logisim: “Oscillation apparent”

I am trying to simulate an RS master slave flip-flop in Logisim, and I have encountered the "Oscillation apparent" error. What does this error mean and how is it resolved? I am required to use two nor ...
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69 views

Help me understand Mealy machine with D flip flops vs JK flip flops

So, the task is to implement a synchronous sequential circuit which detects the input sequence "1101" using D flip flops and standard logic gates (represent with Mealy machine with finite number of ...
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640 views

What is race around condition in flip-flops?

I've gone through two of my text books and consulted my teacher but nothing seems to clarify my doubts. The two versions of race-around which I've been taught are - When the S and R inputs of an ...
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99 views

D flip flop with asynchronous level triggered reset

Ref : Is making a D flip flop with asynchronous level triggered reset possible? My code : ...
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491 views

Clock divider circuit with flip D flip flop

I am using D flip flops in my clock divider circuit. I have started with one FF and moving up with the number of divisions I want to have in my clock. This is how I want my D ffs to work. Now I ...
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89 views

What is the inverted output for on a D flip flop?

I was asked to find the answer for this, it is a pretty vague question: On a D Flip Flop, what is the Q' output? Look this up and write your answer in your pre-lab report. I am trying to understand ...
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126 views

A simple clarification on latches and flip-flops

Here are two representations of a gated SR latch (first one from my book and the second one from Wikipedia): The part I don't understand are the S and R inputs, why are they reversed in these two ...
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27 views

Modeling Rocker Switch with Block Xilinx System Generator

I am working on a project for the detection of QRS complex. I would make it with Xilinx system generator. I need to detect the thresholds at the output of the block and to detect from the TRIGGER ...
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62 views

Unsure if this asynchronous D-Flip-Flop Verilog code makes sense

This is my code for an async-reset-set D-flip-flop. I'm using quartus, and the module compiles, but there is no way to check if my logic is valid. I could use some outside opinions. The reset is ...
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1answer
171 views

problem with making 1 bit RAM memory using transistors?

I'm trying to make 1 bit RAM using four transistor ( 2 NOR Gates ). I built the 2 copies of the following circuit: I connected a LED to the output "F". Also, I connected Another LED to the output ...
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157 views

Reset of a JK flip flop pulse indicator

I've made a circuit with 74HC109 JK flip flops. The purpose is to catch a pulse from two signals and for about 20 seconds keep the stored value (of which pulse came first). My problem is I need to ...
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40 views

Powering on specific pieces of circuitry in sequence

I'm trying to power on specific pieces of circuitry in sequence, and have one piece active at a time. I thought a decade counter would be the way to go but most people seem to think a decade counter ...
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111 views

JK Flip Flop toggle action

How does toggle action in a JK flip flop change to alternate states? When both inputs are 1 ,the output of nor gates is forced to 0,then how come they toggle ?
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124 views

How to initiate Preset and Clear in a JK flip flop?

I want to use a JK flip flop in order to create a toggle output. It is clear that both J and K should be set to 1, as well as the Preset and Clear inputs. In some schematics, a Monostable 555 ...
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2answers
186 views

Generate flip-flops using only combinational logic

Just for fun, I wanted to design and simulate D-type flip-flops using only combinational logic in Verilog (or SystemVerilog). I am using using Verilator for the simulation. My initial attempt, which ...
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250 views

BJT Astable Multivibrator

I have the basic knowledge about multivibrators, but I did not understand the working principles of the circuit schematic provided down below. I have done the basic research about how it works, but ...
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346 views

NAND gate in proteus

I am trying to make a JK flip flop circuit in proteus but 2 of the nand gates does not seem to be working. There are no errors provided. Two of the 2-input nand gates does not seem to show output ...
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61 views

VHDL - Flip Flop inferring on a signal

I have to design a circuit to count up to a number and return to zero. It must have a carry signal (which I named a_o in my circuit) as flag to show that the ...
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1answer
346 views

JK flip flop random start outputs

I am working on a project for college and I have to implement a sort of alarm using only MUX's and JK flip flops and a bread board. The problem I encountered is that whenever I power the whole circuit ...
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5answers
180 views

Understanding D flip flop function - what this thing does

I am trying to understand what a D flip flop does int he context of building a truth table, so I can design a synchronous divide-by-five circuit. That is, count to five and reset. I know I need 3 ...
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2answers
62 views

Unable to toggle SN74HC109

I'm a complete amateur, I've probably gotten a million things wrong with this already. I'm using an SN74HC109 dual j-k" flip-flop chip. I'm trying to toggle the led (forgot to add a resistor in the ...
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1answer
104 views

JK Flipflop design for conveyor project

I have a small project/problem I am working on. While running a conveyor belt continuously with items on it, I need to stamp every other item. I am using a photocell to detect if an item is ...
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91 views

momentary to on/off switch for 12v

I got some oem switches and I want to mod them into light switches. Here is my situation: I would like to use the oem switch since it has illumination and button that matches the car.I have already ...
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237 views

Proteus BJT Astable Multivibrator Simulation Error

I am pretty new in Proteus and made a simple flip flop circuit as shown below. When I run the simulation, the circuit does not work as intended. Both of the LEDs light up at the same time. (LEDs ...